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CrashStats

A355 accidents: crash map and statistics

Police recorded 3,252 collisions on the A355 from 1979 to 2025, with 4,344 casualties. Of those crashes, 60 were fatal and 452 serious, and 64 people were killed.

In 2025 there were 29 collisions on the A355, down 9% from 32 in 2024, with 39 casualties.

Collisions since 1979
3,252
347th highest of 4,923 roads
Casualties
4,344
1.34 per collision
Fatal collisions
60
64 people killed
Serious collisions
452
551 seriously injured
Collisions in 2025
29
Down 9% on 2024
Casualties in 2025
39
Up 8% on 2024

Crash severity on the A355

On the A355, 1.8% of collisions were fatal and 14% serious, against 1.6% and 18% across Great Britain.

Collisions by severity, 1979 to 2025

  • Fatal601.8%
  • Serious45214%
  • Slight2,74084%

Where the A355 ranks among 4,923 roads

Most collisions
347th
Most casualties
352nd
Most fatal collisions
353rd
Most serious collisions
478th

A355 accidents by year

Collisions on the A355 peaked at 108 in 1984 and were down to 29 in 2025.

Collisions and casualties on the A355, 1979 to 2025

  • Collisions
  • Collisions in 2025: 29
  • Casualties

Source: Department for Transport, STATS19 road safety data

View as a table
YearCollisionsCasualties
20252939
20243236
20233546
20223447
20213240
20202226
20193240
20184367
20174154
20164055
20155982
20145874
20135879
20125881
201172104
20106587
20094869
20087092
20076095
200683112
20056581
200479102
200396120
200287109
2001107142
200080103
199993126
199893126
199785115
199683111
199586111
199490121
1993101128
199277105
199184115
199083107
198978112
198891135
198778115
198690125
198582109
1984108125
198381109
198277106
19817394
19805870
19797697

When crashes happen on the A355

Friday has the most collisions on the A355 (552), and 3pm to 6pm is the busiest time of day (768).

Collisions by day of the week

  • Monday447 (14%)
  • Tuesday490 (15%)
  • Wednesday468 (14%)
  • Thursday514 (16%)
  • Friday552 (17%)
  • Saturday474 (15%)
  • Sunday307 (9.4%)

Collisions by time of day

  • Midnight to 3am90 (2.8%)
  • 3am to 6am48 (1.5%)
  • 6am to 9am454 (14%)
  • 9am to noon464 (14%)
  • Noon to 3pm583 (18%)
  • 3pm to 6pm768 (24%)
  • 6pm to 9pm515 (16%)
  • 9pm to midnight330 (10%)

Collisions by month

  • January265 (8.1%)
  • February216 (6.6%)
  • March237 (7.3%)
  • April263 (8.1%)
  • May269 (8.3%)
  • June286 (8.8%)
  • July299 (9.2%)
  • August270 (8.3%)
  • September280 (8.6%)
  • October271 (8.3%)
  • November313 (9.6%)
  • December283 (8.7%)

Light conditions at the time

  • Daylight2,321 (71%)
  • Dark, street lights lit784 (24%)
  • Dark, no street lighting87 (2.7%)
  • Dark, lighting unknown49 (1.5%)
  • Dark, street lights unlit10 (0.3%)
  • Not recorded1 (under 0.1%)

Source: Department for Transport, STATS19 road safety data

Road and weather conditions in A355 crashes

On the A355, 50% of collisions happened where the speed limit was 30 mph and 68% on a dry road surface.

Speed limit at the scene

  • 20 mph16 (0.5%)
  • 30 mph1,641 (50%)
  • 40 mph375 (12%)
  • 50 mph116 (3.6%)
  • 60 mph713 (22%)
  • 70 mph389 (12%)
  • Not recorded2 (0.1%)

Weather at the time

  • Fine, no high winds2,636 (81%)
  • Raining, no high winds382 (12%)
  • Raining with high winds41 (1.3%)
  • Fine with high winds24 (0.7%)
  • Other127 (3.9%)
  • Not recorded42 (1.3%)

Road surface

  • Dry2,213 (68%)
  • Wet or damp930 (29%)
  • Frost or ice54 (1.7%)
  • Flood over 3cm deep11 (0.3%)
  • Other12 (0.4%)
  • Not recorded32 (1%)

Type of road

  • Single carriageway1,656 (51%)
  • Dual carriageway789 (24%)
  • Roundabout768 (24%)
  • One way street or slip road36 (1.1%)
  • Not recorded3 (0.1%)

Source: Department for Transport, STATS19 road safety data

People hurt and vehicles involved in A355 crashes

Car occupants make up 68% of the people killed or injured on the A355, followed by motorcyclists (11%).

Casualties by road user

  • Car occupant2,949 (68%)
  • Motorcyclist496 (11%)
  • Pedestrian389 (9%)
  • Cyclist290 (6.7%)
  • Van occupant110 (2.5%)
  • Goods vehicle occupant (over 3.5 tonnes)32 (0.7%)
  • Other76 (1.7%)
  • Not recorded2 (under 0.1%)

Vehicles involved

  • Car5,090 (77%)
  • Motorcycle512 (7.8%)
  • Pedal cycle296 (4.5%)
  • Van or goods vehicle up to 3.5 tonnes295 (4.5%)
  • Goods vehicle over 3.5 tonnes201 (3.1%)
  • Bus or coach51 (0.8%)
  • Other120 (1.8%)
  • Not recorded15 (0.2%)

Casualties by age

  • 0 to 561 (1.4%)
  • 6 to 10104 (2.4%)
  • 11 to 15148 (3.4%)
  • 16 to 20609 (14%)
  • 21 to 25634 (15%)
  • 26 to 351,044 (24%)
  • 36 to 45650 (15%)
  • 46 to 55430 (9.9%)
  • 56 to 65287 (6.6%)
  • 66 to 75135 (3.1%)
  • Over 75123 (2.8%)
  • Not recorded119 (2.7%)

Drivers, passengers and pedestrians

  • Driver or rider2,895 (67%)
  • Passenger1,060 (24%)
  • Pedestrian389 (9%)

Source: Department for Transport, STATS19 road safety data

Map of recent crashes on the A355

Map of the 25 most recent crashes on the A355

Use the arrow keys to move the map and the plus and minus keys to zoom.

  • 25 crashes
  • Fatal
  • Serious
  • Slight

A355 crashes by council area

Collisions on the A355 were recorded in 5 council areas. Slough has the most, with 1,787, followed by Buckinghamshire (1,351) and Windsor and Maidenhead (90).

Collisions on the A355 in each area, 1979 to 2025
RankAreaCollisionsCasualtiesFatalSerious
1stSlough1,7872,24418216
2ndBuckinghamshire1,3511,94540219
3rdWindsor and Maidenhead90124113
4thEastleigh111100
5thSouthampton91213

A355 crashes by town

Collisions on the A355 were recorded in 6 towns and built-up areas, led by Slough (1,248) and Farnham Common and Farnham Royal (306).

Recent crashes on the A355

These are the 25 most recent collisions on the A355, from 29 January to 9 December 2025.

Severity